Measles is highly contagious, and immunization rates in some counties are below the 95% recommended for herd immunity.

Measles is highly contagious, and immunization rates in some counties are below the 95% recommended for herd immunity.

New cases of measles are popping up across Florida, with 15 illnesses confirmed statewide, according to data from the Florida Department of Health.

But other cases, including 20 in Collier County and one in Pinellas County, don’t show up on the department’s website. It updates every Thursday, and by then the information is many days old. As of Monday, the case count ends Jan. 31.

“Weekly updates may be fine when you’re not in an active outbreak,” said Candace DiMatteis, vice president of policy and advocacy at the Partnership to Fight Infectious Diseases in Washington, D.C.